Apparatus for discharging DC-link capacitor for electric vehicle charger

1. An apparatus for charging a high voltage battery of an electric vehicle by converting an AC power source to a DC power source, the apparatus comprising: a rectifier configured to receive the AC power source and convert the AC power source to a rectified DC power source; a boost PFC (Power Factor Control) circuit configured to correct a power factor by receiving the rectified DC power source; a DC-link capacitor configured to be charged when connected to an output of the boost PFC circuit; a DC-DC converter configured to charge the high voltage battery by converting a voltage charged in the DC-link capacitor; a controller configured to control the rectifier, the boost PFC circuit and the DC-DC converter; and an auxiliary power supply unit connected to the DC-link capacitor and configured to supply a power source to the controller when the apparatus operates abnormally, the power source supplied by: discharging a voltage charged in the DC-link capacitor; converting the discharged voltage; and providing the converted voltage to the controller.

2. The apparatus of claim 1 , wherein the auxiliary power supply unit includes an SMPS (Switching Mode Power Supply).

3. The apparatus of claim 1 , wherein the auxiliary power supply unit is electrically connected to both ends of the DC-link capacitor.

4. The apparatus of claim 1 , wherein the controller is further configured to: discontinue operations of the rectifier, the boost PFC circuit and the DC-DC converter when the apparatus operates abnormally.

5. The apparatus of claim 1 , wherein the controller is further configured to: receive a power source from a low voltage battery connected to the controller before the DC-link capacitor is fully charged; and receive the power source from the auxiliary power supply unit when the DC-link capacitor is fully charged.